The present invention relates to methods and arrangements in a base station and a user equipment for determining an uplink transmission timing correction for communication in a telecommunication system in which aggregation of component carriers is applied. The base station receives a signal from the user equipment on an uplink (UL) component carrier and measures the arrival time of the signal. A timing correction of the UL transmission timing based on the arrival time of the signal is determined. Thereupon the base station determines for which of the uplink component carriers used by the user equipment the timing correction is valid. The timing correction and the validity information is sent to the user equipment. The user equipment adjusts the UL transmission timing for each UL component carrier the timing correction is valid for.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method in a user equipment for determining an uplink transmission timing correction for communication in a telecommunication system in which aggregation of component carriers is applied, the method comprising: sending a signal on an uplink component carrier to a base station; receiving a timing correction of the uplink transmission timing and information on which uplink component carrier the timing correction is valid for from the base station; and adjusting the uplink transmission timing of the uplink component carrier the timing correction is valid for based on the timing correction.
2. The method according to claim 1 , wherein the information on which uplink component carrier the timing correction is valid for is configured via Radio Resource Control (RRC) signaling.
3. The method according to claim 1 , wherein the information on which uplink component carrier the timing correction is valid for is signaled with Medium Access Control (MAC) control elements.
4. The method according to claim 1 , wherein the timing correction is received in a timing advance command.
5. The method according to claim 1 , wherein a message comprising both the timing correction and information on which of the uplink component carriers the timing correction is valid for is received from the base station via Radio Resource Control (RRC) or Medium Access Control (MAC) control elements.
6. A base station for determining an uplink transmission timing correction for communication in a telecommunication system in which aggregation of component carriers is applied, the base station comprising: a receiver for receiving a signal on a selected uplink component carrier from a user equipment; a unit for measuring an arrival time of the received signal; a unit for determining a timing correction of the uplink transmission timing based on the measured arrival time, and for determining for which of the uplink component carriers used by the user equipment the determined timing correction is valid; and a transmitter for sending the timing correction and information on which of the uplink component carriers the timing correction is valid for to the user equipment.
7. The base station according to claim 6 , wherein the determination for which of the uplink component carriers the determined timing correction is valid is based on the downlink timing reference associated with the respective Uplink (UL) component carrier.
8. The base station according to claim 7 , wherein the timing correction is determined to be valid for the uplink component carrier which has an associated downlink timing reference aligned with the downlink timing reference associated with the selected uplink component carrier.
9. The base station according to claim 8 , wherein the downlink timing reference is a synchronization signal or reference signal of one downlink component carrier.
10. The base station according to claim 7 , wherein the timing correction is determined to be valid for the uplink component carrier which has an associated downlink timing reference with a defined offset relative to the downlink timing reference associated with the selected uplink component carrier.
11. The base station according to claim 7 , wherein the downlink timing references are synchronization signals or reference signals on different downlink component carriers.
12. The base station according to claim 6 , wherein the timing correction is determined to be valid for only the selected uplink component carrier when the component carriers are time division duplex carriers with different downlink or uplink allocations across the carriers.
13. The base station according to claim 6 , wherein the information on which uplink component carrier the timing correction is valid for is configured via Radio Resource Control (RRC) signaling.
14. The base station according to claim 6 , wherein the information on which uplink component carrier the timing correction is valid for is signaled with Medium Access Control (MAC) control elements.
15. A user equipment for determining an uplink transmission timing correction for communication in a telecommunication system in which aggregation of component carriers is applied, the user equipment comprising: a transmitter for sending a signal on an uplink component carrier to a base station; a receiver for receiving a timing correction of the uplink transmission timing and information on which uplink component carrier the timing correction is valid for from the base station; and a unit for adjusting the uplink transmission timing of the component carrier the timing correction is valid for based on the timing correction.
16. The user equipment according to claim 15 , wherein information on which uplink component carrier the timing correction is valid for is configured via Radio Resource Control (RRC) signaling.
17. The user equipment according to claim 15 , wherein information on which uplink component carrier the timing correction is valid for is signaled with Medium Access Control (MAC) control elements.
18. The user equipment according to claim 15 , wherein the timing correction is received in a timing advance command.
19. The user equipment according to claim 15 , wherein a message comprising both the timing correction and information on which of the uplink component carriers the timing correction is valid for is received from the base station via Radio Resource Control (RRC) or Medium Access Control (MAC) control elements.
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March 19, 2019
September 29, 2020
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